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Note 12 - Pension and Other Postretirement Benefit Plans - Employee Benefit Trust (EBT) Shares (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Shares owned by Employee Benefit Trust, beginning balance (in shares)	445,022	551,762
Shares purchased (in shares)	13,669	11,631
Shares released and allocated (in shares)	(129,601)	(118,371)
Shares owned by Employee Benefit Trust, ending balance (in shares)	329,090	445,022
Market value of unallocated shares	$ 7,085,308	$ 12,238,105

X

- Definition

Number of shares purchased during the period by the Employee Trust.

+ References

No definition available.

+ Details

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Namespace Prefix:	ffic_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Common stock released and allocated by the Employee Trust.

+ References

No definition available.

+ Details

Name:	ffic_CommonStockSharesReleasedAndAllocatedByTheEmployeeTrust
Namespace Prefix:	ffic_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate value of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19833-108362

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 25
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19850-108362

+ Details

Name:	us-gaap_CommonStockIssuedEmployeeTrustDeferred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 25
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16701-113920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant